With perm rods, different what produce different degrees of curl activation?

With perm rods, different what produce different degrees of curl activation?

• A. Diameters
• B. Colors
• C. Lengths
• D. Materials

Answer: (A)

The thing that controls how tightly the hair curls with perm rods is the diameter of the rod. The diameter sets the radius of the curl you’re forming—the smaller the diameter, the tighter the curl and the more activation you see in the hair after processing. A larger diameter gives a looser curl and less activation. Length or material of the rod can influence how long a curl is or how the rod holds up during processing, and color or branding might indicate size in some lineups, but the degree of curl activation is driven primarily by the rod’s diameter.

The thing that controls how tightly the hair curls with perm rods is the diameter of the rod. The diameter sets the radius of the curl you’re forming—the smaller the diameter, the tighter the curl and the more activation you see in the hair after processing. A larger diameter gives a looser curl and less activation. Length or material of the rod can influence how long a curl is or how the rod holds up during processing, and color or branding might indicate size in some lineups, but the degree of curl activation is driven primarily by the rod’s diameter.